CN104081818B

CN104081818B - Wireless signal sending method and wireless device

Info

Publication number: CN104081818B
Application number: CN201380007721.9A
Authority: CN
Inventors: 村上友规; 浅井裕介; 工藤理; 工藤理一; 石原浩; 石原浩一; 沟口匡人; 市川武男
Original assignee: Nippon Telegraph and Telephone Corp
Current assignee: Nippon Telegraph and Telephone Corp
Priority date: 2012-02-06
Filing date: 2013-02-04
Publication date: 2018-12-04
Anticipated expiration: 2033-02-04
Also published as: EP3780414B1; US10491274B2; WO2013118675A1; EP2800416A4; JP6067592B2; US20200076482A1; US20230049652A1; US10778296B2; US20140376535A1; US11509362B2; CN109379113A; JPWO2013118675A1; EP3547565B1; US11025313B2; CN104081818A; US20180138952A1; EP2800416A1; EP3547565A1; EP3780414A1; US10158402B2

Abstract

The present invention avoids the interference in targeting signal and pilot signal in the coordinating transmissions for having used interference mitigation technology.In the wireless system at least 1 wireless device, the wireless device that the wireless signal for having carried out directive property control is sent to terminal station is had: being generated and is additional to the known signal generating unit of the known signal of the wireless signal, the weight arithmetic processing section of weight operation is carried out to the known signal generated by the known signal generating unit and sends the wireless processing section for having carried out the known signal of weight operation by the weight arithmetic processing section.

Description

Wireless signal sending method and wireless device

Technical field

The present invention relates to used the Wireless LAN base station (Local Area Network: local area network) while having sent signal The wireless signal sending method and wireless device of interference mitigation technology.In addition, the present invention relates to for multiuser MIMO one side Obtain the technology for carrying out space division multiplexing transmission on one side with the backwards compatibility of previous wireless device.

The application was based on 2 6th, 2012 Patent 2012-No. 023086 and on 2 24th, 2012 to Japanese publication It is claimed priority to Patent 2012-038195 of Japanese publication, and by their content quotation in this.

Background technique

As the high-speed wireless access system for using 5GHz band, there is IEEE(Institute of Electrical and Electronics Engineers: Institute of Electrical and Electric Engineers) 802.11a specification.Within the system, used as with In orthogonal frequency division multiplexing (the OFDM:Orthogonal Frequency for the technology for making the stability of characteristics in multipath fading environments Division Multiplexing) modulation system, realize maximum 54Mbps(bits per second: bps) handle up Amount.But handling capacity herein is handling capacity on a physical layer, in fact, in MAC(Medium Access Control: Media access control) efficiency of transmission in layer is 50~70% or so, therefore, the upper limit value of actual handling capacity is 30Mbps left Right (for example, referring to non-patent literature 1).

In turn, in IEEE802.11n, to realize that high-speed communication as target, is able to achieve maximum by following technology The transmission speed of 600Mbps: spatial reuse can be realized using synchronization and same channel using mutiple antennas MIMO(Multiple input multiple output: multiple-input and multiple-output) it is technology, individual up to now using 2 simultaneously The channel for the 20MHz that ground is used and the frame aggregation for utilizing the technology of the channel of 40MHz, being sent by bundling multiple frames (frame aggregation), using block ACK(Acknowledge) signal control signal expense reduction and realize The technologies such as efficient activity (for example, referring to non-patent literature 1).

In addition, in recent years, the demand of wireless communication is rapidly increasing, the base station for being provided with Wireless LAN in many places. But in communication cell (being made of 1 stylobate station and the terminal station Duo Tai) close environment, there are the letters of close communication cell It is number interfering with each other, not can be carried out the problem of good wireless communication (in general, in the wireless communications such as portable phone, Wireless LAN system In system, it is considered as the minimum unit of wireless network by 1 wireless base station or by the communication cell that base station and multiple terminal stations are constituted).

For this problem, following technology (using the coordinating transmissions technology of interference mitigation technology): multiple base stations is being studied The mutiple antennas loaded using each base station, by changing the amount of phase rotation of the signal sent from each antenna, to control electricity The directive property (send beam forming) of wave, on one side inhibiting to carry out itself communication while the interference to close communication cell, by This, increases handling capacity by (for example, referring to non-patent literature 2).In using the interference mitigation technology for sending beam forming, in advance The propagation channel between our station and the terminal station for applying interference is obtained, inhibit according to the propagation channel Transmit weight of interference Calculating, communicated using Transmit weight, carry out AF panel as a result,.Here, propagation channel indicates electric wave from transmission day The receiving intensity and the amount of phase rotation of signal when line travels to receiving antenna.

Figure 21 is to show the general block diagram that can be carried out and send the structure of Wireless LAN transmitter of beam forming.Such as Figure 21 Shown, Wireless LAN transmitter is by 100-1~100-A of error correction coding department, 101-1~101-A of interleaving treatment portion, subcarrier-modulated 103-1-1~103-B-A of portion, weight arithmetic processing section 104, IFFT(Inverse Fast Fourier Transform: quickly Inverse Fourier transform) 105-1~105-C of portion, GI(Guard Interval: protection interval) 106-1~106-C of appendix, RF 107-1~107-C of (Radio Frequency: radio frequency) processing unit, 108-1~108-C of antenna, leading generating unit 109, pilot tone Subcarrier generating unit 110, wireless signal demodulation section 111, propagation channel acquisition unit 112, weight calculation unit 113 are constituted.

100-1~100-A of error correction coding department carries out the convolutional encoding of inputted data.Interleaving treatment portion 101-1~ 101-A progress bit exchanges the transmission so that the contiguous bits after being encoded in the subcarrier left as far as possible.Subcarrier 103-1-1~103-B-A of modulation portion is according to the BPSK(Binary Phase Shift specified in Wireless LAN standard specification Keying: binary phase shift keying) or QPSK(Quadrature Phase Shift Keying: quadrature phase shift keying) etc. adjust Mode processed is modulated the data for carrying out interleaving treatment.

Weight arithmetic processing section 104 carries out data in each subcarrier and according to the calculated Transmit weight of propagation channel Multiplying.When the frequency sequence data for having carried out weight operation are transformed to by 105-1~105-C of IFFT Department by IFFT operation Between sequence data.106-1~106-C of GI appendix is replicated during being the fixation to the rear end of IFFT output signal and will The block that the front end of itself and IFFT output signal links together.107-1~107-C of RF processing unit will be added using simulation RF device The baseband signal of GI is transformed to wireless signal.108-1~108-C of antenna radiates wireless signal to aerial.

Leading generating unit 109 is generated for carrying out the nothing being made of known signal (targeting signal and pilot subcarrier signals) The Timing Synchronization of line signal and the targeting signal of Frequency Synchronization.The generation of pilot sub-carrier generating unit 110 is made of known signal For correcting the pilot subcarrier signals of residual frequency error.The progress of wireless signal demodulation section 111 sends wireless from terminal station The demodulation of signal obtains the data portion for including in wireless signal.Data portion of the propagation channel acquisition unit 112 after demodulation obtains The propagation channel of each subcarrier is simultaneously saved.Weight calculation unit 113 uses the propagation channel of each subcarrier obtained, into The calculating of row Transmit weight.

As shown in figure 21, in Wireless LAN transmitter, by being converted in various pieces to transmission data, so as to Enough generate can be carried out the wireless LAN signals for sending beam forming and be sent.

In addition, the MIMO transmission used in IEEE802.11n is in a pair of opposite base station (AP:Access Point) It is carried out between terminal station (STA:STAtion), by the way that the data of sending object will be used as to distribute to mutiple antennas, from multiple Antenna is concurrently sent, i.e., is sent in a manner of spatial reuse, so that handling capacity be made to improve.

In turn, it in the IEEE802.11ac formulated at present, as the wireless system for applying MIMO transmission, is carrying out Referred to as MU(Multi User: multi-user)-MIMO technology research, the technology is by base station and multiple terminal stations to same Wireless channel carries out spatial reuse to carry out the communication more than 1 pair, so as to efficiently use wireless space resource (for example, referring to non- Patent document 3).In MU-MIMO, multiple radio terminal stations are issued by using beam forming spatially to separate in wireless base station Data grouping improve handling capacity as a result, to be communicated in a manner of spatial reuse.

Here, MU-MIMO transmission is concretely demonstrated referring to attached drawing.

Figure 22 is the block diagram for showing MU-mimo transmission system structure.Communication system shown in Figure 22 has base station 1110 With the terminal station 1111,1112 for carrying out wireless packet communications with the base station 1110.In addition, H₁And H₂Indicate propagation channel.

Figure 23 is the time diagram for illustrating the work of MU-MIMO transmission.As shown in figure 23, in MU-MIMO transmission, frame It consists of the following parts: confirming carrier sense (CS) that whether other radio stations communicated, notice Empty packet The Empty packet notice (NDPA:Null Data Packet Announcement) of transmission, the empty data being made of empty data Be grouped (NDP:Null Data Packet), notice according to the beam forming of NDP propagation channel information estimate report (BR: Beamforming Report), request propagation channel information beam forming report poll (BRP:Beamforming Report Poll), whether signal is correctly received for the data (data 1 and data 2) in terminal station 1111 and terminal station 1112, notice Block ACK(BACK:Block Acknowledgment) and request block ACK block ACK request (BACKR:Block Acknowledgment Request).

Assuming that producing data (the sending object number for the grouping to send to terminal station 1111,1112 in base station 1110 According to).Correspondingly, base station 1110 executes carrier sense (CS) by random time interval.By carrier sense, determine It is which of idle state that communication band is not used by and busy condition that communication band is currently being used.

For example, it is assumed that being detected by the carrier sense (CS) executed in moment t101 is sky that communication band is not used by Not busy state.Correspondingly, such as t103 to t104 at the time of have passed through after some time from moment t102 of base station 1110 In a period of generate and NDPA and sent.

Then, base station 1110 is raw in a period of t105 to t106 at the time of have passed through after some time from moment t104 At propagation channel estimation NDP and sent.At this point, base station 1110 identifies the end of the destination of above-mentioned sending object data End station 1111,1112.Then, same terminal station 1111,1112 is appointed as destination by base station 1110, is sent measurement and is used Signal.

In response to the reception of said determination signal, terminal station 1111,1112 is identical from moment t105 to t106's During measure propagation channel characteristics.Then, terminal station 1111,1112 generates in a period of from moment t106 to t107 includes Propagation channel characteristics or BR according to the calculated information of propagation channel characteristics.

Then, terminal station 1111 from moment t106 at the time of have passed through after some time in a period of t107 to t108 Send BR.

Then, base station 1110 is right in a period of t109 to t110 at the time of have passed through after some time from moment t108 Terminal station 1112 generates the BRP of request propagation channel information and is sent.

Then, terminal station 1112 in response to above-mentioned BRP reception, after have passed through some time from moment t110 when BR is sent in a period of carving t111 to t112.

Then, base station 1110 is carried out the calculating of Transmit weight using the BR being notified and sends the generation of signal.This Outside, base station 1110 at the time of have passed through after the stipulated time from moment t112 in a period of t113 to t114 to sending object number According to being sent.Further more, the data sent in a period of from moment t113 to t114 are for example transformed to be suitable for channel radio The frame of letter.In addition, the data sent in a period of from moment t113 to t114, which become, to be connected in the case where applying frame aggregation The data cell of the frame of specified quantity is tied.

Then, terminate in response to the reception with moment t114 accordingly data, terminal station 1111 from moment t114 through BACK is sent in a period of t115 to t116 at the time of after having spent some time.Base station 1110 receive the BACK, and execute with Processing as defined in the reception of the BACK is corresponding.It is being received specifically, base station 1110 is for example judged as according to the reception of BACK Side normally has received data, and is transferred to the processing of next data transmit-receive.In addition, being not received by BACK and overtime In the case where, base station 1110 executes and carries out the processing such as retransmitting to sending object data.

Then, base station 1110 is right in a period of t117 to t118 at the time of have passed through after some time from moment t116 Terminal station 1112 generates the BACKR of request BACK and is sent.

Then, terminal station 1112 from moment t118 at the time of have passed through after some time in a period of t119 to t120 Send BACK.Base station 1110 receives the BACK, and executes defined processing corresponding with the reception of the BACK.

In non-patent literature 3, MU-MIMO transmission is carried out according to above such time diagram.

Existing technical literature

Non-patent literature

Non-patent literature 1: keep just rich storehouse, Kubo Tian Zhouzhi, " changing three editions 802.11 high-speed wireless LAN textbooks ", Pp.206,242-243, Impress R&D, on March 27th, 2008；

Non-patent literature 2:D. Gesbert, S. Hanly, H Huang, S. Shitz, O. Simeone, and W. Yu, “Multi–cell MIMO cooperative networks: A new look at interference”, IEEE Journal on Selected Areas in Communications, in December, 2010；

Non-patent literature 3:IEEE P802.11ac/D1.0 Draft STANDARD for Information Technology–Telecommunications and information exchange between systems–Local and metropolitan area networks–Specific requirements Part 11: Wireless LAN Medium Access Control(MAC) and Physical Layer(PHY) specifications Amendment 5: Enhancements for Very High Throughput for Operation in Bands below 6 GHz, 2011 May in year；

Non-patent literature 4:IEEE P802.11n/D11.0 Draft STANDARD for Information Technology–Telecommunications and information exchange between systems–Local and metropolitan area networks–Specific requirements Part 11: Wireless LAN Medium Access Control(MAC) and Physical Layer(PHY) specifications Amendment 5: Enhancements for Higher Throughput, in June, 2009.

Summary of the invention

Subject to be solved by the invention

However, in the coordination for used using Wireless LAN transmitter shown in multiple Figure 21 interference mitigation technology In the case where transmission, data portion carries out directive property control, and accordingly, there exist following problems: cannot inhibit not to be directed toward Property control known signal (targeting signal and pilot subcarrier signals) interference, mutual signal become interference, handling capacity is not Rise.That is, in the structure of Wireless LAN transmitter up to now, not to the targeting signal and pilot tone as common signal Sub-carrier signal carries out weight calculation process.Therefore, in the case where carrying out having used the coordinating transmissions of interference mitigation technology, with Up to now the structure of Wireless LAN transmitter not can be carried out normal communication.

In addition, in wireless lans, it is specified that several times after receiving signal until being sent.It is most short Stipulated time be 16 μ s.For example, base station in the case where receiving the signal from terminal station, needed first from the time of reception The generation for carrying out targeting signal within the stipulated time is played, is being sent after the stipulated time.

Up to now, because without weight calculation process in the generation of targeting signal, can the stipulated time with Inside sent.In addition, even if having carried out weight calculation process, in the case where the antenna number in base station, terminal station is few, calculation amount Also few, it can also be generated within the stipulated time and send signal.However, in recent years, in order to carry out the transmission of high speed, large capacity, base The antenna number of the antenna number and terminal station stood is increasing, and the calculation amount of weight operation is also increasing.In this case, it deposits The problem of sending signal cannot be being generated within the stipulated time.

In addition, in above-mentioned non-patent literature 3, as the base station that can use the standard criterion defined recorded herein 1110 carry out MU-MIMO transmission condition with multiple terminal stations 1111,1112, need using by mark identical with base station 1110 Standard standardizes defined multiple terminal stations 1111,1112.That is, included in base station in multiple terminal stations 1111,1112 In the case where terminal station before standard criterion, MU-MIMO transmission not can be carried out.This is because with each standard criterion regulation The pilot signal as known signal be each interference.Hereinafter, being illustrated referring to attached drawing to the problem.

Figure 24 is when showing the use 20MHz band in the IEEE802.11ac standard criterion recorded in non-patent literature 3 Wireless signal structure concept map.Wireless signal has L-STF(non-HT(non-High Throughput: non-height gulps down The amount of spitting) short training field: short training field), L-LTF(non-HT long training field: long training Field), L-SIG(non-HT SIGNAL field), VHT-SIG-A(VHT(Very High Throughput: it is very high Handling capacity) SIGNAL-A field), VHT-STF(VHT short training field), VHT-LTF(VHT long Training field), VHT-SIG-B(VHT SIGNAL-B field) and data.

Then, Figure 25 is the use shown in the standard criterion of the IEEE802.11n recorded in non-patent literature 4 The concept map of the structure of wireless signal when 20MHz band.Wireless signal has L-STF, L-LTF, L-SIG, HT-SIG(HT SIGNAL field), HT-STF(HT short training field), HT-LTF(HT long training field), And data.

For example, being provided in Figure 25 in the terminal station (terminal station 11ac) that can receive the frame specified in Figure 24 and capable of receiving Frame terminal station (terminal station 11n) exist and base station 1110 to both the terminal station 11n, the terminal station 11ac carry out MU- (that is, carrying out the feelings of space division multiplexing transmission simultaneously to the terminal station 11ac and the terminal station 11n in the base station 11ac in the case where MIMO transmission Under condition), the signal from the terminal station 11ac becomes interference, and the terminal station 11n can not read L-SIG, HT-SIG and pilot tone letter Number.

Similarly, in the terminal station 11ac, the signal from the terminal station 11n become interference, can not read L-SIG, VHT-SIG-A and pilot signal.This is because become send signal generation in not to above-mentioned signal application wave beam at The structure of shape.Therefore, interference is respectively become to the signal in the terminal station 11n and the terminal station 11ac in above-mentioned signal, MU-MIMO is passed It is defeated to become difficult.

The present invention allows for such situation and completes, and does it is intended that providing one kind and can reduce to have used Disturb the wireless signal sending method and wireless device of the interference in the coordinating transmissions of suppression technology.

It is further an object that provide a kind of base station can same frequency and synchronization to by with The terminal station and spatial multiplexing transmission is carried out by the terminal station that specification before this is constituted that the identical specification in base station is constituted Technology.

Solution for solving the problem

In order to solve above-mentioned problem, the present invention is a kind of wireless signal sending method, and at least 1 stylobate station will be referred to The wireless signal of tropism control is sent to terminal station, and the wireless signal sending method includes: known signal generation step, generates It is additional to the known signal of the wireless signal；Weight operation processing step carries out weight operation to the known signal；And Wireless processing step sends the known signal for having carried out the weight operation.

In the present invention, being also possible at least 1 stylobate station is the multiple bases for respectively constituting different communication cells Stand, also include: extraction step is carried in the son for extracting from the propagation channel that the terminal station obtains with sending the known signal The corresponding propagation channel of wave；And targeting signal weight operation processing step, it is calculated based on the propagation channel extracted Weight carries out weight operation to the known signal.

In the present invention, be also possible in the targeting signal weight operation processing step, by be based on and hair Send the corresponding calculated weight of propagation channel of the subcarrier of the known signal and the known signal into In the wireless processing step, the weight is transported so that precalculating weight operation finishes known signal for row multiplying Calculation finishes known signal and is additional to the wireless signal to be sent.

In the present invention, be also possible to also include: save step, the weight operation precomputed described in preservation finishes Known signal, in the wireless processing step, read and save in the preservation step in defined transmission timing described in Weight operation finishes known signal, the weight operation of reading is finished known signal is additional to the wireless signal and carry out It sends.

In the present invention, being also possible at least 1 stylobate station is single base station, also includes: weight calculation step, Based on from the first receiving station being made up of the first specification and be made up of different from first specification the second specifications the The propagation channel information of two receiving stations notice, calculates the weight coefficient of the subcarrier of a part；And Power Interpolation step, it is based on The weight coefficient of the subcarrier of described a part, calculates the weight coefficient of remaining subcarrier, at the weight operation It manages in step, falls into a trap based on the weight coefficient calculated in the weight calculation step and in the Power Interpolation step The weight coefficient calculated carries out the weight operation.

In the present invention, being also possible at least 1 stylobate station is single base station, is walked in the weight calculation process In rapid, based on from the first receiving station being made up of the first specification and passing through second specifications different from first specification and constitute The propagation channel information of the second receiving station notice carry out the weight operation, the wireless signal sending method also includes: altogether With signal generation step, common known signal is generated based on first specification；And common signal sending step, send institute State common known signal.

In the present invention, can also also include: response signal sending step connects from first receiving station or described second The receiving station being made up of older specification received in station first sends response signal.

The present invention is a kind of wireless device, in the wireless system at least 1 wireless device, will carry out directive property The wireless signal of control is sent to terminal station, and the wireless device has: known signal generating unit, and generation is additional to described wireless The known signal of signal；Weight arithmetic processing section weighs the known signal generated by the known signal generating unit Operation again；And wireless processing section, send the known signal that the weight operation has been carried out by the weight arithmetic processing section.

In the present invention, being also possible at least 1 wireless device is respectively constitute different communication cells multiple Wireless device is also equipped with: extraction unit, is being extracted from the propagation channel that the terminal station obtains and is being sent the known signal The corresponding propagation channel of subcarrier；And targeting signal weight arithmetic processing section, based on the institute extracted by the extraction unit It states propagation channel and calculates weight, weight operation is carried out to the known signal using the weight.

In the present invention, be also possible to the targeting signal weight arithmetic processing section by based on described in transmission The corresponding calculated weight of propagation channel of the subcarrier of known signal and the known signal carry out multiplication Operation finishes known signal to precalculate weight operation, and it is attached that the weight operation is finished known signal by the wireless processing section The wireless signal is added on to be sent.

In the present invention, be also possible to be also equipped with: leading storage unit is saved by targeting signal weight operation The weight operation that reason portion precomputes finishes known signal, and the wireless processing section is read in defined transmission timing The weight operation saved in the leading storage unit finishes known signal, and the weight operation of reading is finished known letter Number the wireless signal is additional to be sent.

In the present invention, being also possible at least 1 wireless device is single wireless device, also includes weight meter Calculation portion, based on from the first receiving station being made up of the first specification and passing through different from first specification the second specifications and constitute The second receiving station notice propagation channel information, calculate a part subcarrier weight coefficient；And Power Interpolation portion, base In the weight coefficient of the subcarrier of described a part, the weight coefficient of remaining subcarrier is calculated, at the weight operation Reason portion is based on by the calculated weight coefficient of the weight calculation unit and by the calculated power in the Power Interpolation portion Weight coefficient carries out the weight operation.

In the present invention, being also possible at least 1 wireless device is single wireless device, the weight operation Processing unit based on from by first specification constitute the first receiving station and pass through the second specification structure different from first specification At the propagation channel information of the second receiving station notice carry out the weight operation, the wireless device is also equipped with: common signal Generating unit generates common known signal based on first specification；And common signal transmission unit, send it is described it is common Know signal.

Invention effect

In accordance with the invention it is possible to reduce the interference in the coordinating transmissions for having used interference mitigation technology.

In addition, using the present invention, base station can be in same frequency and synchronization to passing through standard identical with base station It standardizes the terminal station constituted and spatial multiplexing transmission is carried out by the terminal station that standard criterion before this is constituted.

Detailed description of the invention

Fig. 1 is for illustrating that the 1st embodiment~the 3rd embodiment of the invention has used AF panel as premise The concept map of the coordinating transmissions of technology.

Fig. 2 is the block diagram for showing the outline structure of the base station 200-1,200-2 in the 1st embodiment of the invention.

Fig. 3 is the block diagram for showing the outline structure in the terminal station 201-1,201-2 in the 1st embodiment of the invention.

Fig. 4 be show the 1st embodiment according to the present invention in base station 200-1,200-2 and terminal station 201-1,201- The exemplary timing diagram of communication sequence between 2.

Fig. 5 is for illustrating the base station 200-1 of the 1st embodiment according to the present invention and terminal station 201-1,201-2 The flow chart of communication sequence.

Fig. 6 is the block diagram for showing the outline structure of base station 200-1,200-2 of the 2nd embodiment according to the present invention.

Fig. 7 is for illustrating the base station 200-1 of the 2nd embodiment according to the present invention and terminal station 201-1,201-2 The flow chart of communication sequence.

Fig. 8 is the block diagram for showing the outline structure of base station 200-1,200-2 of the 3rd embodiment according to the present invention.

Fig. 9 is the base station 200-1,200-2 and terminal station 201-1,201-2 for showing the 3rd embodiment according to the present invention Between the exemplary timing diagram of communication sequence.

Figure 10 be base station 200-1 for illustrating the 3rd embodiment according to the present invention and terminal station 201-1,201-2 with The flow chart for the processing sequence that the generation for the targeting signal that weight operation finishes accordingly executes.

Figure 11 is for illustrating in the 3rd embodiment of the invention base station 200-1 and terminal station 201-1 to be counted The flow chart of the processing sequence executed according to transmitting-receiving.

Figure 12 is the MU-mimo transmission system structure for showing the 4th embodiment~the 7th embodiment according to the present invention Block diagram.

Figure 13 is the block diagram for showing the functional structure of the base station 1110 in the 4th embodiment.

Figure 14 is the block diagram for showing the functional structure in the terminal station 1111 in the 4th embodiment.

Figure 15 is the block diagram for showing the functional structure in the terminal station 1113 in the 4th embodiment.

Figure 16 is the communication sequence between base station 1110 and terminal station 1111,1113 shown according to the 4th embodiment Exemplary timing diagram.

Figure 17 be show in the 5th embodiment base station 1110 terminal station 1111 of same standard criterion is sent it is wireless The concept map of the structure of signal.

Figure 18 is the block diagram for showing the functional structure of the base station 1110 in the 5th embodiment.

Figure 19 is the block diagram for showing the functional structure of the base station 1110 in the 6th embodiment.

Figure 20 is the timing diagram for illustrating the communication sequence in the 7th embodiment.

Figure 21 is to show the general block diagram that can be carried out and send the structure of Wireless LAN transmitter of beam forming.

Figure 22 is the block diagram for showing MU-mimo transmission system structure.

Figure 23 is the time diagram for illustrating the work of MU-MIMO transmission.

Figure 24 is when showing the use 20MHz band in the IEEE802.11ac standard criterion recorded in non-patent literature 3 Wireless signal structure concept map.

Figure 25 is when showing the use 20MHz band in the standard criterion of the IEEE802.11n recorded in non-patent literature 4 Wireless signal structure concept map.

Specific embodiment

Hereinafter, the embodiments of the present invention will be described with reference to the drawings.

Firstly, pressing down before being illustrated to the 1st embodiment~the 3rd embodiment of the invention to having used to interfere The generation method of Transmit weight in the coordinating transmissions of technology processed is concretely demonstrated.

Fig. 1 is for illustrating that the 1st embodiment~the 3rd embodiment of the invention has used AF panel as premise The concept map of the coordinating transmissions of technology.As shown in Figure 1, wireless system have 2 base stations 200-1,200-2, with base station 200-1 into The terminal station 201-1 of row wireless packet communications and the terminal station 201-2 that wireless packet communications are carried out with base station 200-2.Terminal Stand 201-1 belong to base station 200-1 administration communication cell 202-1, led to via base station 200-1 with external network (not shown) Letter.In addition, terminal station 201-2 belongs to the communication cell 202-2 of the administration of base station 200-2, via base station 200-2 and external network into Row communication.

Each base station 200-1,200-2 uses CSMA/CA(Carrier Sense with each terminal station 201-1,201-2 Multiple Access/Collision Avoidance: Carrier Sense Multiple Access/conflict avoidance) mode is wireless to carry out Packet communication.In addition, carrying out the wireless packet communications in 2 communication cells 202-1 and 202-2 using same channel.In nothing Identifier in line packet communication, in the packet radio of transmitting-receiving comprising expression dispatching station, destination station.Here, dispatching station is The device of packet radio is generated and sent, destination station is the device of the destination as packet radio.

In addition, there are the regions that communication cell 202-1 and communication cell 202-2 overlap each other, in the region in Fig. 1 In, mutual wireless packet communications interfere, therefore, by the communication band of channel in communication cell 202-1 and communication cell In 202-2 be divided in portion carry out using.

In addition, as shown in Figure 1, by between base station 200-1 and terminal station 201-1, base station 200-2 and terminal station 201-2 it Between, the propagation channel between base station 200-2 and terminal station 201-1, between base station 200-1 and terminal station 201-2 be set to H₁、 H₂、G₁、G₂.For example, the antenna radical of base station is set as 2N, the antenna radical in terminal station is set as N.

When carrying out singular value decomposition, each base station and close to the propagation channel G between communication cell₁Or G₂It can be as numerical expression (1) It is indicated like that.But because can be carried out same calculating in base station 200-1 and 200-2, behind base is only shown The calculation method stood in 200-1.

[ numerical expression 1 ]

Here, U is left singular value matrix, Σ is in the subduplicate diagonal matrix diagonally with characteristic value, and V is right unusual Value matrix.Then, according to a part of V and H₁It exports numerical expression (2).

[ numerical expression 2 ]

In this example embodiment, numerical expression (3) is Transmit weight W.

[ numerical expression 3 ]

Transmit weight W is calculated with above method.

[ the 1st embodiment ]

Firstly, being illustrated to the 1st embodiment of the invention.

[ architecture of base station ]

Fig. 2 is the block diagram for showing the outline structure of the base station 200-1,200-2 in this 1st embodiment.As shown in Fig. 2, Base station 200-1,200-2 has 100-1~100-A of error correction coding department, 101-1~101-A of interleaving treatment portion, subcarrier-modulated portion 103-1-1~103-B~A, weight arithmetic processing section 104,105-1~105-C of IFFT Department, 106-1~106-C of GI appendix, It is 107-1~107-1C of RF processing unit, 108-1~108-C of antenna, leading generating unit 109, pilot sub-carrier generating unit 110, wireless Signal demodulation section 111, propagation channel acquisition unit 112 and weight calculation unit 113.

Further more, because 100-1~100-A of error correction coding department, 101-1~101-A of interleaving treatment portion, subcarrier-modulated portion 103-1-1~103-B-A, weight arithmetic processing section 104,105-1~105-C of IFFT Department, 106-1~106-C of GI appendix, RF 107-1~107-C of processing unit, 108-1~108-C of antenna, leading generating unit 109, pilot sub-carrier generating unit 110, wireless communication Number demodulation section 111, propagation channel acquisition unit 112 and weight calculation unit 113 are that structural element corresponding with shown in Figure 21 is same The function of sample, so omitting the description.

The knot of general Wireless LAN transmitter shown in the structure and Figure 21 of base station in 1st embodiment shown in Fig. 2 The difference of structure is, the output destination of targeting signal and pilot subcarrier signals.In Fig. 2, make from leading generating unit 109 Targeting signal and the pilot subcarrier signals from pilot sub-carrier generating unit 110 output destination be weight calculation process Portion 104 can be carried out the weight calculation process of targeting signal and pilot subcarrier signals as a result,.

Further more, above-mentioned leading generating unit 109 and pilot sub-carrier generating unit 110 are equivalent to the known letter in claims Number generating unit.In addition, above-mentioned targeting signal and pilot subcarrier signals are equivalent to the known signal in claims.In addition, 107-1~107-1C of RF processing unit is equivalent to the wireless processing section in claims.

[ terminal station structure ]

Then, the structure in terminal station 201-1,201-2 is illustrated.

Fig. 3 is the block diagram for showing the outline structure in the terminal station 201-1,201-2 in this 1st embodiment.Such as Fig. 3 institute Show, terminal station 201-1,201-2 has 300-1~300-D of antenna, 301-1~301-D of radio section, propagation channel characteristics measurement Portion 302, storage unit 303 and propagation channel characteristics notification unit 304.

300-1~300-D of antenna radiates wireless signal to aerial.Radio section 301-1~301-D is inputted respectively to be sent Data, signal implement frame, defined modulation treatment etc. to generate transmission signal.In addition, 301-1~301-D of radio section distinguishes Input receives demodulation process as defined in signal and execution etc..Propagation channel characteristics determination part 302 is wireless using sending from base station Targeting signal in signal measures propagation channel.Storage unit 303 stores the biography measured by propagation channel characteristics determination part 302 Broadcast channel.The generation of propagation channel characteristics notification unit 304 makes stored propagation channel be contained in the wireless signal in data portion.

[ the communication sequence example of base station and terminal station ]

Fig. 4 is shown according to this 1st embodiment between base station 200-1,200-2 and terminal station 201-1,201-2 The exemplary timing diagram of communication sequence.Further more, in Fig. 4 when illustrating, about access control mode, to use CSMA/CA for before It mentions.

It will be to the data (hair for the grouping that terminal station 201-1,201-2 is sent assuming that being produced in base station 200-1,200-2 Send object data).Correspondingly, base station 200-1 executes carrier sense (CS) by random time interval.It is detectd by carrier wave It listens, judgement is which of the idle state that communication band is not used by and the busy condition that communication band is used.

For example, it is assumed that by it is shown in Fig. 4 at the time of the carrier sense that executes of t0 detect and do not made in communication band Idle state.Correspondingly, base station 200-1 for example at the time of have passed through after the defined time from moment t0 t1 to In a period of t2, generates the measurement signal of propagation channel estimation and sent.At this point, base station 200-1 identifies above-mentioned hair Send the terminal station 201-1,201-2 of the destination of object data.Then, base station 200-1 by same terminal station 201-1, 201-2 are appointed as destination, send measurement signal.

In response to the reception of said determination signal, terminal station 201-1,201-2 is in the identical phase from moment t1 to t2 Interior measurement propagation channel characteristics.Then, terminal station 201-1 at the time of have passed through after the defined time from moment t2 t3 to In a period of t4, generates the propagation channel notification signal comprising propagation channel characteristics and sent.In addition, terminal station 201-2 At the time of have passed through after the defined time from moment t4 in a period of t5 to t6, the propagation comprising propagation channel characteristics is generated Channel notification signal is simultaneously sent.

Base station 200-1 uses the propagation channel of acquirement in response to receiving propagation channel notification signal after moment t3 Come carry out each subcarrier Transmit weight calculating, carried out using calculated Transmit weight send signal generation.

Similarly, in base station 200-2, at the time of have passed through after the defined time from moment t6 during t7 to t8 It is interior, it generates the measurement signal of propagation channel estimation and is sent.At this point, base station 200-2 identifies above-mentioned sending object number According to destination terminal station 201-1,201-2.Then, same terminal station 201-1,201-2 is specified in base station 200-2 For destination, measurement signal is sent.

In response to the reception of said determination signal, terminal station 201-1,201-2 is in the identical phase from moment t7 to t8 In, measure propagation channel characteristics.Then, t9 at the time of have passed through after the defined time from moment t8 of terminal station 201-1 To t10, generates the propagation channel notification signal comprising propagation channel characteristics and sent.In addition, terminal station 201-2 in a period of t11 to t12, generate special comprising propagation channel at the time of have passed through after the defined time from moment t10 The propagation channel notification signal of property is simultaneously sent.

Base station 200-2 uses the propagation channel of acquirement in response to receiving propagation channel notification signal after moment t9 Come carry out each subcarrier Transmit weight calculating, carried out using calculated Transmit weight send signal generation.

Then, base station 200-1,200-2 from moment t12 at the time of have passed through after the stipulated time during t13 to t14 It is interior, sending object data are sent.Here, the stipulated time is the stipulated time specified in Wireless LAN standard specification.Example SIFS(Short Inter Frame Space in this way: short interFrameGap) 16 μ s.Further more, in the phase from moment t13 to t14 The data of interior transmission are for example transformed to be suitable for the frame of wireless communication.In addition, in the case where applying frame aggregation, from The data sent in a period of moment t13 to t14 become the data cell for having linked the frame of specified quantity.

Then, terminate in response to the reception with moment t14 accordingly data, terminal station 201-1 from moment t14 by ACK is sent in a period of t15 to t16 at the time of after defined time.Base station 200-1 receives the ACK, and executes and be somebody's turn to do Processing as defined in the reception of ACK is corresponding.Specifically, base station 200-1 for example according to the reception of ACK be judged as receiving side just Data often are had received, and are transferred to the processing of next data transmit-receive.Alternatively, in the feelings for being not received by ACK and time-out Under condition, base station 200-1 executes and carries out the processing such as retransmitting to sending object data.Alternatively, passing through frame aggregation sending data And in the case where being linked with multiple frames, send frame ACK back to.In this case, 200-1 reception based on frame shown in frame ACK of base station As a result, retransmitting becomes the frame for receiving mistake.

Similarly, terminal station 201-2 from moment t16 at the time of have passed through after the defined time during t17 to t18 Interior transmission ACK.Base station 200-2 receives the ACK, and executes defined processing corresponding with the reception of the ACK.

As described above, in this 1st embodiment, whenever generating sending object data, according to from above-mentioned moment t0 to The sequence of t18 carries out the transmitting-receiving of data between base station 200-1,200-2 and terminal station 201-1,201-2.

[ signal generates processing sequence example ]

Fig. 5 is suitable according to the base station 200-1 of this 1st embodiment and the communication in terminal station 201-1,201-2 for illustrating The flow chart of sequence.Further more, the signal about base station 200-2 generates processing sequence, because identical as base station 200-1, omit Explanation.The processing of base station 200-1 shown in fig. 5 can regard the processing that either one or two of function part shown in Fig. 2 is appropriately performed as. In addition, the processing in terminal station 201-1,201-2 shown in fig. 5 can regard that either one or two of function part shown in Fig. 3 is suitably held as Capable processing.

In base station 200-1, determine whether to produce sending object data (step S101), does not generate sending object number It is standby to generation sending object data in the case where ("No" of step S101).Then, sending object data are being produced In the case of ("Yes" of step S101), base station 200-1 executes carrier sense and determines whether to detect idle state (step S102).Then, in the case where idle state is not detected ("No" of step S102), base station 200-1 is standby until detecting Until idle state.

Then, when executing carrier sense and detecting idle state ("Yes" of step S102), base station 200-1, which generates, to be passed Channel measurement signal is broadcast, terminal station 201-1,201-2 identical with above-mentioned sending object data is appointed as destination and is come pair The propagation channel measurement is sent (step S103) with signal.

Terminal station 201-1 determines whether it has received measurement signal (step S201), is not receiving measurement signal In the case of ("No" of step S201), it is standby until receiving measurement signal.On the other hand, when receive measurement with letter Number when ("Yes" of step S201), in response to the transmission of the measurement signal, letter is propagated in the measurement of propagation channel characteristics determination part 302 Road characteristic makes storage unit 303 store the propagation channel characteristics (step S202) as measurement result.Then, propagation channel characteristics Notification unit 304 generates the notification signal for notifying the propagation channel characteristics stored in storage unit 303, and sends it to base Stand 200-1(step S203).

Similarly, in terminal station 201-2, measurement signal (step S301) is also determined whether it has received, is not being received It is standby until receiving measurement signal in the case where measurement signal ("No" of step S301).On the other hand, when When receiving measurement signal ("Yes" of step S301), in response to the transmission of the measurement signal, propagation channel characteristics measurement Portion 302 measures propagation channel characteristics, and storage unit 303 is made to store the propagation channel characteristics (step S302) as measurement result.It connects , propagation channel characteristics notification unit 304 generates the notice letter for notifying the propagation channel characteristics stored in storage unit 303 Number, and send it to 200-1(step S303 of base station).

On the other hand, in base station 200-1, propagation channel acquisition unit 112 is logical according to what is received from terminal station 201-1 Know that signal obtains propagation channel characteristics (step S104), similarly, is obtained according to the notification signal received from terminal station 201-2 Propagation channel characteristics (step S105).Then, weight calculation unit 113 carries out each subcarrier using the propagation channel obtained The calculating (step S106) of Transmit weight.

Then, in base station 200-1, weight arithmetic processing section 104 uses the Transmit weight of calculated each subcarrier, To the targeting signal generated in leading generating unit 109, the pilot subcarrier signals generated in pilot sub-carrier generating unit 110 Weight calculation process is carried out, the data-signal (step S107) that weight operation finishes is generated.Then, it in base station 200-1, is connecing It receives and sends the data-signal that above-mentioned weight operation finishes after the stipulated time after the notification signal that terminal station 201-2 is sent (step S108).

On the other hand, it in terminal station 201-1, is received by 301-1~301-D of radio section from base station 200-1 and is sent Data-signal (step S204).Then, in terminal station 201-1, when terminating data receiver, ACK is sent to base station 200-1 (step S205).

In base station 200-1, the transmission in response to data-signal terminates, and executes with the ACK's from the transmission of terminal station 201-1 Receive corresponding defined processing (step S109).

According to the 1st above-mentioned embodiment, pass through what is generated to leading generating unit 109 and pilot sub-carrier generating unit 110 Targeting signal and pilot subcarrier signals carry out weight calculation process, dry in targeting signal and pilot signal so as to avoid It disturbs, can increase handling capacity.

[ the 2nd embodiment ]

Then, the 2nd embodiment of the invention is illustrated.

[ architecture of base station ]

Fig. 6 is the block diagram for showing the outline structure of base station 200-1,200-2 of the 2nd embodiment according to the present invention.Such as Shown in Fig. 6, base station 200-1,200-2 has 100-1~100-A of error correction coding department, 101-1~101-A of interleaving treatment portion, sub- load 103-1-1~103-B of wave modulation portion~A, weight arithmetic processing section 104,105-1~105-C of IFFT Department, GI appendix 106-1 ~106-C, 107-1~107-C of RF processing unit, 108-1~108-C of antenna, leading generating unit 109, pilot sub-carrier generating unit 110, wireless signal demodulation section 111, propagation channel acquisition unit 112, targeting signal weight arithmetic processing section 114 and extraction Portion 115.

Further more, because 100-1~100-A of error correction coding department, 101-1~101-A of interleaving treatment portion, subcarrier-modulated portion 103-1-1~103-B-A, weight arithmetic processing section 104,105-1~105-C of IFFT Department, 106-1~106-C of GI appendix, RF 107-1~107-C of processing unit, 108-1~108-C of antenna, leading generating unit 109, pilot sub-carrier generating unit 110, wireless communication Number demodulation section 111 and the structural element corresponding with shown in Figure 21 of propagation channel acquisition unit 112 are same functions, so saving Slightly illustrate.

In this 2nd embodiment, not configured using targeting signal in whole subcarriers but only in specific son The processing time of weight calculation process is reduced in carrier wave by transmission this point.

Extraction unit 115 extracts propagation channel corresponding with the subcarrier of targeting signal is used for from the propagation channel of acquirement, And forward lead the output of signal weight arithmetic processing section 114.In addition, will propagation channel output corresponding with whole subcarriers To weight arithmetic processing section 104.Targeting signal is with weight arithmetic processing section 114 based on inputting with leading letter from extraction unit 115 Number the corresponding propagation channel of subcarrier calculate weight, carry out the weight calculation process of targeting signal.

Like this, by the way that propagation channel corresponding with the subcarrier of targeting signal is sent only is calculated power as object Weight can also carry out at weight operation the targeting signal sent in the file leader of packet radio so as to shorten the processing time Reason.

[ terminal station structure ]

Because the structure in the terminal station 201-1,201-2 according to this 2nd embodiment is identical as Fig. 3, so omitting the description.

[ the communication sequence example of base station and terminal station ]

Because the timing diagram according to this 2nd embodiment is identical as Fig. 4, so omitting the description.

[ signal generates processing sequence example ]

Fig. 7 is suitable according to the base station 200-1 of this 2nd embodiment and the communication in terminal station 201-1,201-2 for illustrating The flow chart of sequence.Further more, the signal about base station 200-2 generates processing sequence, because identical as base station 200-1, omit Explanation.The processing of base station 200-1 shown in Fig. 7 can regard the processing that either one or two of function part shown in fig. 6 is appropriately performed as. In addition, the processing in terminal station 201-1,201-2 shown in Fig. 7 can regard that either one or two of function part shown in Fig. 3 is suitably held as Capable processing.

In base station 200-1, determine whether to produce sending object data (step S401), does not generate sending object number In the case where ("No" of step S401), the standby generation to sending object data.Then, sending object data are being produced In the case where ("Yes" of step S401), base station 200-1 executes carrier sense and determines whether to detect idle state (step S402).Then, in the case where idle state is not detected ("No" of step S402), base station 200-1 is standby until detecting Until idle state.

On the other hand, when execute carrier sense and detect be idle state when ("Yes" of step S402), base station 200-1 Generate propagation channel measurement signal, will terminal station 201-1,201-2 identical with above-mentioned sending object data it is specified for the purpose of Ground to the propagation channel measurement is sent (step S403) with signal.

On the other hand, in base station 200-1, propagation channel acquisition unit 112 is logical according to what is received from terminal station 201-1 Know that signal obtains propagation channel characteristics (step S404), similarly, is obtained according to the notification signal received from terminal station 201-2 Propagation channel characteristics (step S405).

Then, in base station 200-1, extraction unit 115 extracts propagation channel corresponding with the subcarrier of targeting signal is used for, Targeting signal is based on extracted propagation channel corresponding with subcarrier with weight arithmetic processing section 114, carries out for leading letter Number subcarrier Transmit weight calculating (step S406).Then, targeting signal uses calculating with weight arithmetic processing section 114 Transmit weight out and targeting signal carry out weight calculation process, and carry out the generation for the targeting signal that weight operation finishes (step S407).

In addition, concurrently with step S407, weight arithmetic processing section 104 carries out the son other than targeting signal subcarrier and carries The calculating (step S408) of the Transmit weight of wave uses the Transmit weight and data of the subcarrier other than targeting signal subcarrier Signal, to carry out the generation (step S409) for the data-signal that weight operation finishes.

Then, in base station 200-1, targeting signal generated and data-signal are being received from terminal station 201-2 (step S410) is sent since targeting signal after stipulated time after the notification signal of transmission.Here, even if in number It is believed that number the unclosed situation of generation under, the transmission of targeting signal can also be carried out in the case where have passed through the stipulated time.

In base station 200-1, the transmission in response to data-signal terminates, and executes with the ACK's from the transmission of terminal station 201-1 Receive corresponding defined processing (step S411).

According to the 2nd above-mentioned embodiment, with the transmission for whole subcarriers carried out by weight arithmetic processing section 104 The generation for the data-signal that calculating, the weight operation of weight finish concurrently carries out: the slave propagation channel carried out by extraction unit 115 In to the extraction of propagation channel corresponding with the subcarrier for targeting signal, by targeting signal weight arithmetic processing section 114 The generation for the targeting signal that calculating, the weight operation of the Transmit weight of the subcarrier for targeting signal carried out finish, therefore, The generation time of targeting signal can be shortened.

[ the 3rd embodiment ]

Then, the 3rd embodiment of the invention is illustrated.

[ architecture of base station ]

Fig. 8 is the block diagram for showing the outline structure of base station 200-1,200-2 of the 3rd embodiment according to the present invention.Such as Shown in Fig. 8, base station 200-1,200-2 has 100-1~100-A of error correction coding department, 101-1~101-A of interleaving treatment portion, sub- load 103-1-1~103-B of wave modulation portion~A, weight arithmetic processing section 104,105-1~105-C of IFFT Department, GI appendix 106-1 ~106-C, 107-1~107-1C of RF processing unit, 108-1~108-C of antenna, leading generating unit 109, pilot sub-carrier generating unit 110, wireless signal demodulation section 111, propagation channel acquisition unit 112, targeting signal weight arithmetic processing section 114, extraction unit 115 and leading storage unit 116.

Further more, because 100-1~100-A of error correction coding department, 101-1~101-A of interleaving treatment portion, subcarrier-modulated portion 103-1-1~103-B-A, weight arithmetic processing section 104,105-1~105-C of IFFT Department, 106-1~106-C of GI appendix, RF 107-1~107-C of processing unit, 108-1~108-C of antenna, leading generating unit 109, pilot sub-carrier generating unit 110, wireless communication Shown in number demodulation section 111, propagation channel acquisition unit 112, targeting signal weight arithmetic processing section 114, extraction unit 115 and Fig. 2 Structure or structure shown in fig. 6 it is identical, so, omit the description.

Leading storage unit 116 is saved by each destination terminal station and is calculated by targeting signal weight arithmetic processing section 114 The targeting signal that weight operation out finishes.That is, by being used to the targeting signal as fixed signal and according to targeting signal Weight that the propagation channel of subcarrier precomputes carries out multiplying, to generate targeting signal that weight operation finishes simultaneously It is stored in leading storage unit 116.The leading letter finished as a result, without all generating weight operation when sending packet radio every time Number, therefore, the processing time can be shortened.

[ terminal station structure ]

Because the structure in the terminal station 201-1,201-2 according to this 3rd embodiment is identical as Fig. 3, so omitting the description.

[ the communication sequence example of base station and terminal station ]

Fig. 9 is shown according to this 3rd embodiment between base station 200-1,200-2 and terminal station 201-1,201-2 The exemplary timing diagram of communication sequence.In this 3rd embodiment, firstly, base station 200-1,200-2 is pre- in defined timing The targeting signal finished with each corresponding weight operation in terminal station 201-1,201-2 is first calculated, is stored it in leading In storage unit 116.Hereafter, base station 200-1,200-2 is read when generating sending object data every time from leading storage unit 116 The targeting signal that finishes with each corresponding weight operation in the terminal station 201-1,201-2 of destination is simultaneously set, into Row data are sent.Like this, in this 3rd embodiment, for calculating and storing the work for the targeting signal that weight operation finishes Make and data transmit-receive carries out in different chances respectively.

Firstly, base station 200-1 passes through the random time when reaching the generation timing for the targeting signal that weight operation finishes Interval executes the propagation channel measurement carrier sense of signal transmission.Further more, being finished as weight operation to be generated leading The timing of signal is contemplated that following such timing.

For example, one of them is initial set when starting as base station 200-1 and successively carries out and establish at this moment The generation of targeting signal and determining for storage that each corresponding weight operation in the terminal station 201-1,201-2 of connection finishes When.In addition, one of them is to carry out communicating with as it in the case where initially carrying out data transmit-receive after the starting of base station 200-1 The generation of targeting signal and determining for storage that each corresponding weight operation in the terminal station 201-1,201-2 of other side finishes When.

In fig. 9, it is assumed that base station 200-1 detects idle state by the carrier sense executed in moment t0.With this Accordingly, at the time of have passed through after the set time from moment t0 in a period of t1 to t2, base station 200-1 generates propagation channel Measurement signal is simultaneously sent.At this point, base station 200-1 will be selected to be the object that the targeting signal that weight operation finishes generates Terminal station 201-1,201-2 sends measurement signal as a purpose.

In response to the reception of said determination signal, terminal station 201-1,201-2 is in the identical phase from moment t1 to t2 Interior measurement propagation channel characteristics.Then, terminal station 201-1,201-2 is during from moment t3 to t4 or from moment t5 to t6 Interior transmission propagation channel characteristics notification signal.

Base station 200-1 carried out using the above-mentioned propagation channel characteristics notification signal received weight operation finish it is leading The targeting signal that weight operation generated finishes is stored in leading storage unit 116 by the generation of signal.Further more, that will weigh The terminal when targeting signal that operation finishes again is stored in leading storage unit 116, with the destination for being appointed as measurement signal Stand 201-1,201-2 address (MAC Address) is mapped and is saved.

Similarly, also according to timing diagram identical with base station 200-1, progress weight operation finishes leading for base station 200-2 The targeting signal that weight operation generated finishes is stored in leading storage unit 116 by the generation of signal.

Then, it is assumed that the defined timing after storing the targeting signal that weight operation finishes as described above, Produced in base station 200-1,200-2 the corresponding terminal station 201-1 of the targeting signal that will be finished with the weight operation saved, 201-2 sending object data as a purpose.Correspondingly, base station 200-1 executes carrier sense (CS).Here, passing through The carrier sense (CS) that the timing of t14 executes at the time of shown in Fig. 9 detects it is idle state.Correspondingly, base station 200-1,200-2 before t15, read the destination with sending object data at the time of reaching as data transmission beginning timing Terminal station 201-1, the targeting signal that finishes of 201-2 corresponding weight operations.

Then, terminal station 201-1 or 201-2 is sent out during since moment t15 to t16 in base station 200-1,200-2 The targeting signal and sending object data for sending weight operation to finish.

In response to the end that data are sent, time of the terminal station 201-1 after it have passed through the defined time from moment t16 ACK is sent in a period of point t17 to t18, base station 200-1 receives the ACK.Similarly, terminal station 201-2 is in terminal station 201-1 ACK send after, send ACK, base in a period of the time point t19 to t20 after have passed through the defined time from moment t18 Stand 200-2 receive the ACK.

Further more, herein, it is contemplated that the case where producing multiple frames (grouping) as sending object data.Correspondingly, Be shown in FIG. 9 successively executed after the transmitting-receiving of data and ACK from above-mentioned moment t14 to t20 frame unit data and The state of the transmitting-receiving of ACK.From the transmitting-receiving for showing last data and ACK during moment t21 to t27.

[ processing sequence example ]

Figure 10 is for illustrating to be transported according to the base station 200-1 of this 3rd embodiment and terminal station 201-1,201-2 and weight The flow chart for the processing sequence that the generation of the targeting signal finished accordingly executes.Further more, processing shown in Fig. 10 is to be used for The processing of the generation for the targeting signal that weight operation finishes is performed in accordance with terminal station 201-1,201-2.

In base station 200-1, finished in response to becoming to execute with terminal station 201-1,201-2 corresponding weight operations The timing of generation and the storage of targeting signal executes step 501~S507 processing.Further more, because step S501~S506 Processing is identical as step S402~S407 in Fig. 7, so omitting the description.

After the processing of above-mentioned steps S501~S506, the targeting signal that weight operation generated finishes is stored in In leading storage unit 116 (step S507).At this point, the end that measurement signal will be had sent to generate this targeting signal The address of end station 201-1,201-2 is mapped with the targeting signal that weight operation generated finishes to be stored.

In addition, transmission of the terminal station 201-1 in response to the measurement signal from base station 200-1, execution step S201~ The processing of S203.Similarly, terminal station 201-2 executes step in response to the transmission of the measurement signal from base station 200-1 The processing of S301~S303.Because the processing in these terminal stations 201-1,201-2 and Fig. 5, step S201 shown in Fig. 7~ S203, step S301~S303 are identical, so omitting the description.

Figure 11 is for illustrating in this 3rd embodiment base station 200-1 and terminal station 201-1 to carry out data transmit-receive And the flow chart of the processing sequence executed.In base station 200-1, determine whether to produce sending object data (step S601), It is standby to generation sending object data in the case where not generating sending object data ("No" of step S601).Then, it is producing In the case where having given birth to sending object data ("Yes" of step S601), base station 200-1 executes carrier sense to determine whether to detect To idle state (step S602).Then, ("No" of step S602), base station 200-in the case where idle state is not detected 1 is standby until detecting idle state.

Then, when executing carrier sense and when detecting idle state ("Yes" of step S602), base station 200-1 is from leading Storage unit 116 reads weight fortune corresponding with the address in terminal station 201-1,201-2 of the destination as sending object data Calculation finishes targeting signal (step S603).Then, base station 200-1 by sending object data to terminal station 201-1 with frame unit into Row sends (step S604).

On the other hand, in terminal station 201-1, the data (step sent by step S604 from base station 200-1 is received S701), at the end of the reception of the data, ACK(step S702 is sent to base station 200-1).

In base station 200-1, after data transmission, the ACK sent from terminal station 201-1 is received, executes the reception with ACK (step S605) is handled as defined in corresponding.

When terminating above-mentioned data transmission (step S604) and ACK receives alignment processing (step S605), base station 200-1 is sentenced The fixed transmission (step S606) for whether finishing whole sending object data (frame).Here, also remaining not sent transmission In the case where object data ("No" of step S606), processing returns to above-mentioned steps S604 is arrived, data hair is executed again as a result, It send.Then, when sending whole sending object data ("Yes" of step S606), processing returns to arrive step S601.

According to the 3rd above-mentioned embodiment, pass through 114 pairs of the weight arithmetic processing section signals as fixation of targeting signal Targeting signal and multiplying is carried out according to the weight that the propagation channel of targeting signal subcarrier precomputes, generate power Operation finishes again targeting signal is simultaneously stored in leading storage unit 116, as a result, without all raw when sending packet radio every time At the targeting signal that weight operation finishes, therefore, it can more shorten the processing time.

Then, Figure 12 is the MU-mimo transmission system for showing the 4th embodiment~the 7th embodiment according to the present invention Structure block diagram.In Figure 12, MU-mimo transmission system has base station 1110(dispatching station device), by with the base station The terminal station terminal station 1111(11ac that 1110 identical standard criterions (the first specification) are constituted: the first receiving station), pass through base station The terminal station terminal station 1113(11n that standard criterion (the second specification) before 1110 standard criterion is constituted: the second receiving station). In the 4th embodiment~the 7th embodiment of the invention, base station 1110 is to passing through standard criterion structure identical with base station 1110 At terminal station 1111 and MU-MIMO transmission carried out by the previous terminal station 1113 that standard criterion before this is constituted. In the 4th embodiment~the 7th embodiment of the invention, terminal station 1113 passes through before the standard criterion of base station 1110 Standard criterion is constituted.Therefore, in the 4th embodiment~the 7th embodiment of the invention, terminal station 1113 is known as " previous Terminal station 1113 ".In addition, H₁And H₃Respectively indicate propagation channel.

[ the 4th embodiment ]

Firstly, being illustrated to the 4th embodiment of the invention.

In base station 1110 to the terminal station 1111 of standard criterion identical with base station 1110 and the end of previous standard criterion In the case that end station 1113 is sent simultaneously, the whole signals later to L-LTF of base station 1110 include targeting signal to carry out Utilize the space division multiplexing of beam forming.The processing of base station 1110 in this way is to the terminal station 1111 of same standard criterion and previous Both terminal stations 1113 of standard criterion sent simultaneously.

By carrying out space division multiplexing, so as in the terminal station of same standard criterion 1111 and previous standard criterion It carries out while sending in the case where not generating interference between terminal station 1113.At this point, needing to propagate letter to carry out beam forming Road information.But it and can be interfering with each other from the pilot signal of the transmission of terminal station 1113 from the pilot signal of the transmission of terminal station 1111. Therefore, for pilot sub-carrier, you can't get the propagation channel information from terminal station originally.It is thus impossible to the sub- load Wave carries out beam forming.

Therefore, in the 4th embodiment, using according to the subcarrier other than pilot sub-carrier (for example, and pilot sub-carrier Adjacent subcarrier) calculated weight calculates the weight (Power Interpolation) of pilot sub-carrier.Then, later to L-LTF Whole signals carry out weight operation.

Thereby, it is possible to the terminal station being made up of standard criterion identical with the base station 1110 connecting with base station 1110 1111 and by the previous terminal station 1113 that standard criterion before this is constituted include targeting signal and pilot signal come into Traveling wave beam shaping.Therefore, can be simultaneously to the terminal station 1111(11ac terminal of same standard criterion) and previous standard criterion Terminal station 1113(11n terminal) sent, that is, be able to carry out space division multiplexing transmission.

< architecture of base station >

Figure 13 is the block diagram for showing the functional structure of the base station 1110 in the 4th embodiment.As shown in figure 13, base station 1110 It is serial/parallel to have S/P() 1201-1~1201-A of transformation component, 1202-1-1~1202-B-A of subcarrier-modulated portion, at weight operation Reason portion 1203,1204-1~1204-C of IFFT Department, 1205-1~1205-C of GI appendix, 1206-1~1206-C of RF processing unit, 1207-1~1207-C of antenna, wireless LAN signals demodulation section 1208, propagation channel acquisition unit 1209, weight calculation unit 1210, power Weight interpolating portion 1211 and known signal generating unit 1212.

1201-1~1201-A of S/P transformation component divides input signal, and the signal after segmentation is output to each subcarrier tune Portion 1202 processed.Input signal is the later data of L-LTF shown in Figure 24 and Figure 25.Subcarrier-modulated portion 1202-1-1~ 1202-B-A are modulated according to signal of the modulation systems such as BPSK specified in Wireless LAN or QPSK to input.Weight operation Processing unit 1203 is carried out using the signal exported from subcarrier-modulated portion 1202 and the weight exported from Power Interpolation portion 1211 Weight multiplying.

The frequency sequence data for having carried out weight operation are transformed to by 1204-1~1204-C of IFFT Department by IFFT operation The data of time series.1205-1~1205-C of GI appendix during the fixation of the rear end of IFFT output signal to being replicated simultaneously The front end of itself and IFFT output signal is linked together.1206-1~1206-C of RF processing unit will be added using simulation RF device The baseband signal of GI is transformed to wireless LAN signals.1207-1~1207-C of antenna radiates wireless LAN signals to aerial.

Wireless LAN signals demodulation section 1208 carries out the demodulation of the wireless LAN signals sent from terminal station 1111,1113, takes Obtain the data portion for including in wireless LAN signals.Data portion of the propagation channel acquisition unit 1209 after demodulation is obtained except pilot tone The propagation channel of whole subcarriers other than carrier wave is simultaneously saved.Weight calculation unit 1210 carries out acquired pilot tone that removes and carries The calculating of the Transmit weight of whole subcarriers other than wave.

Power Interpolation portion 1211 generates pilot tone according to the Transmit weight of whole subcarriers in addition to pilot sub-carrier and carries The weight of wave is gone forward side by side row interpolation.It is all not related using which type of method about the method generated with interpolation, still, as One example, the average generation pilot sub-carrier of the weight of with good grounds one or more subcarriers adjacent with pilot sub-carrier The method of weight.Known signal generating unit 1212 generates L-STF signal as known signal.

< terminal station structure >

Then, the structure in the terminal station 1111 in the 4th embodiment is illustrated.

Figure 14 is the block diagram for showing the functional structure in the terminal station 1111 in the 4th embodiment.As shown in figure 14, terminal station 1111 have 1301-1~1301-D of antenna, 1302-1~1302-D of wireless LAN signals demodulation section, propagation channel characteristics determination part 1303, storage unit 1304 and propagation channel characteristics notification unit 1305.

1301-1~1301-D of antenna is to aerial radiation wireless LAN signals or receives wireless LAN signals.Wireless LAN signals 1302-1~1302-D of demodulation section inputs the data to be sent, signal respectively, implements frame, defined modulation treatment etc. to generate Signal is sent, also, inputs and receives signal, executes defined demodulation process etc..1303 use of propagation channel characteristics determination part from The targeting signal in wireless LAN signals that base station 1110 is sent measures the propagation channel of subcarrier.Storage unit 1304 is stored in The propagation channel determined in propagation channel characteristics determination part 1303.Propagation channel characteristics notification unit 1305 will be stored Propagation channel includes the generation of the signal in data portion.

Then, the structure in the terminal station 1113 in the 4th embodiment is illustrated.

Figure 15 is the block diagram for showing the functional structure in the terminal station 1113 in the 4th embodiment.As shown in figure 15, terminal station 1113, which have 1301-1~1301-D of antenna, 1306-1~1306-D of previous wireless LAN signals demodulation section, propagation channel characteristics, surveys Determine portion 1303, storage unit 1304 and propagation channel characteristics notification unit 1305.Further more, being marked to part corresponding with Figure 14 same One appended drawing reference simultaneously omits the description.

Previous 1306-1~1306-D of wireless LAN signals demodulation section is according to previous standard criterion, and input will be sent respectively Data, signal, implement frame, defined modulation treatment etc. to generate transmission signal, also, according to previous standard criterion, Input receives signal respectively, executes defined demodulation process etc..

The communication sequence example > of the base station < and terminal station

Figure 16 is the communication sequence between base station 1110 and terminal station 1111,1113 shown according to the 4th embodiment Exemplary timing diagram.Further more, in the figure when illustrating, about access control mode, premised on using CSMA/CA.

Assuming that producing data (the sending object number for the grouping to send to terminal station 1111,1113 in base station 1110 According to).Correspondingly, base station 1110 executes carrier sense (CS) by random time interval.Determined by carrier sense It is which of idle state that communication band is not used by and busy condition that communication band is used.

Then, base station 1110 is raw in a period of t105 to t106 at the time of have passed through after some time from moment t104 At propagation channel estimation NDP and sent.At this point, base station 1110 identifies the end of the destination of above-mentioned sending object data End station 1111,1113.Then, same terminal station 1111,1113 is appointed as destination by base station 1110, is sent measurement and is used Signal.

In response to the reception of said determination signal, terminal station 1111,1113 is identical from moment t105 to t106's During measure propagation channel characteristics.Then, terminal station 1111,1113 generates in a period of from moment t106 to t107 includes Propagation channel characteristics or BR according to the calculated information of propagation channel characteristics.Then, terminal station 1111 is from moment t106 BR is sent in a period of t107 to t108 at the time of after have passed through some time.

Then, base station 1110 is right in a period of t109 to t110 at the time of have passed through after some time from moment t108 Terminal station 1113 generates the BRP of request propagation channel information and is sent.

Then, in response to the reception of above-mentioned BRP, terminal station 1113 after have passed through some time from moment t110 when BR is sent in a period of carving t111 to t112.

Then, base station 1110 passes through weight calculation unit 1210, Power Interpolation portion 1211, known signal generating unit 1212, power Weight arithmetic processing section 1203, using the BR that is notified carry out the calculating of Transmit weight, the weight of pilot sub-carrier interpolation and Send the generation of signal.In addition, base station 1110 at the time of have passed through after the stipulated time from moment t112 t113 to t114's During sending object data are sent.Further more, the data sent in a period of from moment t113 to t114 for example by It is transformed to be suitable for the frame of wireless communication.In addition, in the case where applying frame aggregation, during from moment t113 to t114 The data of interior transmission become the data cell for having linked the frame of specified quantity.

Then, base station 1110 is right in a period of t117 to t118 at the time of have passed through after some time from moment t116 Terminal station 1113 generates the BACKR of request BACK and is sent.

Then, terminal station 1113 from moment t118 at the time of have passed through after some time in a period of t119 to t120 Send BACK.Base station 1110 receives the BACK, and executes defined processing corresponding with the reception of the BACK.

According to the 4th above-mentioned embodiment, using by weight calculation unit 1210 according to the subcarrier other than pilot sub-carrier (adjacent subcarrier) calculated weight, Power Interpolation portion 1211 calculate the weight (Power Interpolation) of pilot sub-carrier, weight The whole signals later to L-LTF of arithmetic processing section 1203 carry out weight operation.Thereby, it is possible to by identical as base station 1110 The terminal station 1111 that constitutes of standard criterion and by the previous terminal station 1113 that standard criterion before this is constituted include Targeting signal and pilot signal carry out beam forming.It therefore, can be simultaneously to the terminal station 1111(11ac of same standard criterion Terminal) and previous standard criterion terminal station 1113(11n terminal) sent, that is, be able to carry out space division multiplexing transmission.

[ the 5th embodiment ]

Then, the 5th embodiment of the invention is illustrated.In the 5th embodiment, base station 1110 is without wave It sends in the case where beam shaping and does not carry out beam forming between the terminal station of previous standard criterion 1113 and send The signal of the identical pattern of signal section (L-STF~HT-SIG in Figure 25) is as the terminal station to same standard criterion 1111 and previous standard criterion terminal station 1113 simultaneously sent in the case where targeting signal, will be hereafter next Part carries out beam forming to each terminal station 1111,1113 to send.

That is, will be present in do not carry out beam forming and the difference between the standard criterion in the part that sends be unified for it is previous The case where standard criterion, is sent.Accordingly, because signal itself is identical, so interference will not be generated.Implement the 5th In mode, base station 1110 is as shown in figure 17 to the structure for the wireless signal that the terminal station 1111 of same standard criterion is sent.

Figure 17 be show in the 5th embodiment base station 1110 terminal station 1111 of same standard criterion is sent it is wireless The concept map of the structure of signal.In Figure 17, according to this wireless signal of the 5th embodiment by L-STF, L-LTF, L-SIG, HT-SIG, VHT-SIG-A, VHT-STF, VHT-LTF, VHT-SIG-B and data are constituted.By constituting like this, so as to Enough prevent the missing of the information generated when VHT-SIG-A is merely replaced with HT-SIG.

The base station <, terminal station structure >

Figure 18 is the block diagram for showing the functional structure of the base station 1110 in the 5th embodiment.In Figure 18, base station 1110 has Standby 1201-1~1201-A of S/P transformation component, 1202-1-1~1202-B-A of subcarrier-modulated portion, weight arithmetic processing section 1203, 1204-1~1204-C of IFFT Department, 1205-1~1205-C of GI appendix, 1206-1~1206-C of RF processing unit, antenna 1207-1 ~1207-C, wireless LAN signals demodulation section 1208, propagation channel acquisition unit 1209, weight calculation unit 1210 and common signal Generating unit 1213.Further more, marking same appended drawing reference to part corresponding with Figure 13 and omitting the description.

In Figure 18, common signal generating unit 1213, which generates, sends out the terminal station 1113 for not carrying out sending beam forming The signal (L-STF, L-LTF, L-SIG, HT-SIG, pilot signal) sent is as common signal.Further more, because terminal station 1111,1113 structure is identical as Figure 14, structure shown in figure 15, so omitting the description.

The communication sequence example of the base station < and terminal station ] >

Because the communication sequence in the 5th embodiment is identical as timing diagram shown in Figure 16, it 6 is said referring to Fig.1 It is bright.

In response to the reception of said determination signal, terminal station 1111,1113 is identical from moment t105 to t106's During measure propagation channel characteristics.Then, terminal station 1111,1113 generates in a period of from moment t106 to t107 includes Propagation channel characteristics or BR according to the calculated information of propagation channel characteristics.

Then, base station 1110 passes through weight calculation unit 1210, common signal generating unit 1213, weight arithmetic processing section 1203 The calculating of Transmit weight and the generation comprising the transmission signal including common signal are carried out using the BR being notified.In addition, base Stand 1110 at the time of have passed through after the stipulated time from moment t112 in a period of t113 to t114 to sending object data into Row is sent.Further more, the data sent in a period of from moment t113 to t114 are for example transformed to be suitable for wireless communication Frame.In addition, the data sent in a period of from moment t113 to t114 become connection in the case where applying frame aggregation The data cell of the frame of specified quantity.

According to the 5th above-mentioned embodiment, generated by common signal generating unit 1213 to not carrying out sending beam forming The signal (L-STF, L-LTF, L-SIG, HT-SIG, pilot signal) that terminal station 1113 is sent, will as common signal It is present in and does not carry out beam forming and the difference between the standard criterion in the part that sends is unified for the feelings of previous standard criterion Condition is sent, accordingly, because signal itself is identical, so interference will not be generated.It therefore, can be simultaneously to same mark Quasi- specification terminal station 1111(11ac terminal) and previous standard criterion terminal station 1113(11n terminal) sent, that is, It is able to carry out space division multiplexing transmission.

[ the 6th embodiment ]

Then, the 6th embodiment of the invention is illustrated.In the 6th embodiment, base station 1110 and the 4th is implemented Mode similarly, is sent out simultaneously in the terminal station 1113 in terminal station 1111 and previous standard criterion to same standard criterion In the case where sending, the whole signals later to L-LTF carry out the space division multiplexing using beam forming, advise as a result, to same standard Both terminal station 1111 and the terminal station 1113 of previous standard criterion of model are sent simultaneously.

By carrying out space division multiplexing, so as in the terminal station of same standard criterion 1111 and previous standard criterion It carries out while sending in the case where not generating interference between terminal station 1113.At this point, can not natively be obtained for pilot sub-carrier The propagation channel information at arrival self terminal station, it is thus impossible to carry out beam forming to the subcarrier.

Therefore, in the 6th embodiment, as pilot signal, using the pilot signal of previous standard criterion, and by its It is sent with omnidirectional antenna.That is, the difference between the standard criterion in pilot signal to be unified for the feelings of previous standard criterion Condition is sent.Accordingly, because signal itself is identical, so interference will not be generated, further, it is possible to solve due to not having About pilot signal propagation channel information and caused by not can be carried out the project of beam forming.

The base station <, terminal station structure >

Figure 19 is the block diagram for showing the functional structure of the base station 1110 in the 6th embodiment.In Figure 19, base station 1110 has Standby 1201-1~1201-A of S/P transformation component, 1202-1-1~1202-B-A of subcarrier-modulated portion, weight arithmetic processing section 1203, 1204-1~1204-C of IFFT Department, 1205-1~1205-C of GI appendix, 1206-1~1206-C of RF processing unit, antenna 1207-1 ~1207-C, wireless LAN signals demodulation section 1208, propagation channel acquisition unit 1209, weight calculation unit 1210 and known signal Generating unit 1214.Further more, marking same appended drawing reference to part corresponding with Figure 13 and omitting the description.

In Figure 19, it is known that signal generation portion 1214, which generates, sends out the terminal station 1113 for not carrying out sending beam forming The signal (L-STF, pilot signal) sent is as common signal.Further more, because the structure and Figure 14 in terminal station 1111,1113, Structure shown in figure 15 is identical, so omitting the description.

The communication sequence example > of the base station < and terminal station

Because the communication sequence in the 6th embodiment is identical as timing diagram shown in Figure 16,6 said referring to Fig.1 It is bright.

Then, terminal station 1113 in response to above-mentioned BRP reception, after have passed through some time from moment t110 when BR is sent in a period of carving t111 to t112.

Then, base station 1110 passes through weight calculation unit 1210, known signal generating unit 1214, weight arithmetic processing section 1203 The calculating of Transmit weight and the generation comprising the transmission signal including common signal are carried out using the BR being notified.In addition, base Stand 1110 at the time of have passed through after the stipulated time from moment t112 in a period of t113 to t114 to sending object data into Row is sent.Further more, the data sent in a period of from moment t113 to t114 are for example transformed to be suitable for wireless communication Frame.In addition, the data sent in a period of from moment t113 to t114 become connection in the case where applying frame aggregation The data cell of the frame of specified quantity.

According to the 6th above-mentioned embodiment, generated by known signal generating unit 1214 to not carrying out sending beam forming The signal (L-STF, pilot signal) that terminal station 1113 is sent uses as common signal, also, as pilot signal The pilot signal of previous standard criterion, and it is sent with omnidirectional antenna, that is, it will be between the standard criterion in pilot signal Difference the case where being unified for previous standard criterion sent.Accordingly, because signal itself is identical, so will not Generate interference, and be able to solve as not about the propagation channel information of pilot signal and caused by not can be carried out wave beam at The project of shape.

[ the 7th embodiment ]

Then, the 7th embodiment of the invention is illustrated.In the 7th embodiment, it is related to carrying out in base station 1110 The exchange (BACK, BACKR etc.) of signal after multi-user MIMO transmissions.The terminal of the transmission of 1110 couples of progress ACK in base station The case where standing in (terminal station of the transmission without BACK) and carry out the terminal station progress multi-user MIMO transmissions of the transmission of BACK Under, there are ACK and BACK to become the case where interfering.This is because there is ACK must be after receiving signal in standard convention 16 μ s after the regulation that sends.

Therefore, in the 7th embodiment, the terminal station for carrying out the transmission of ACK first carries out the transmission of ACK.That is, from by with The terminal station 1111 and the previous end being made up of standard criterion before this that the identical standard criterion in base station 1110 is constituted End station 1113 sends the ACK of signal in response continuous in timely.Therefore, can to connect with base station 1110 by with this The terminal station 1111 and the previous end being made up of standard criterion before this that the identical standard criterion in base station 1110 is constituted End station 1113 carries out space division multiplexing transmission.

The communication sequence example > of the base station < and terminal station

Figure 20 is the timing diagram for illustrating the communication sequence in the 7th embodiment.Further more, previous terminal shown in figure Stand 1113 be send ACK terminal station.

Then, base station 1110 calculating of Transmit weight is carried out using the BR being notified and comprising common signal including Send the generation of signal.In addition, base station 1110 at the time of have passed through after the stipulated time from moment t112 t113 to t114's During sending object data are sent.

Then, terminate in response to the reception with moment t114 accordingly data, previous terminal station 1113 is from moment t114 ACK is sent in a period of t115 to t116 at the time of rising after have passed through some time.Base station 1110 is demodulated by wireless LAN signals Portion's 1208(receiving unit) ACK is received, and execute defined processing corresponding with the reception of the ACK.

Then, base station 1110 is right in a period of t117 to t118 at the time of have passed through after some time from moment t116 Terminal station 1111 generates the BACKR of request BACK and is sent.

Then, terminal station 1111 from moment t118 at the time of have passed through after some time in a period of t119 to t120 Send BACK.Base station 1110 passes through wireless LAN signals demodulation section 1208(receiving unit) BACK is received, and execute and the BACK Reception it is corresponding as defined in processing.

According to the 7th above-mentioned embodiment, the terminal station for carrying out the transmission of ACK first carries out the transmission of ACK.That is, from passing through It terminal station 1111 that identical with base station 1110 standard criterion is constituted and is made up of standard criterion before this previous Terminal station 1113 sends the ACK of signal in response continuous in timely.It therefore, can be to terminal station 1111 and terminal station 1113 Carry out space division multiplexing transmission.

More than, although the embodiments of the present invention are described in detail with reference to the drawings, specific structure is not It is limited to the embodiment, also includes without departing from the design etc. in the range of purport of the invention.

Industrial availability

The present invention can for example be used for wireless communication system.Interference mitigation technology has been used in accordance with the invention it is possible to reduce Interference in coordinating transmissions.In addition, according to the present invention, base station can same frequency and synchronization to by with base station phase The terminal station and pass through the terminal station progress spatial multiplexing transmission that standard criterion before this is constituted that same standard criterion is constituted.

The explanation of appended drawing reference:

200-1,200-2 base stations；

201-1,201-2 terminal stations；

100-1~100-A error correction coding departments；

101-1~101-A interleaving treatment portions；

103-1-1~103-B~A subcarrier-modulated portion；

104 weight arithmetic processing sections；

105-1~105-C IFFT Departments；

106-1~106-C GI appendix；

107-1~107-1C RF processing units；

108-1~108-C antennas；

109 leading generating units；

110 pilot sub-carrier generating units；

111 wireless signal demodulation sections；

112 propagation channel acquisition units；

113 weight calculation units；

114 targeting signals weight arithmetic processing section；

115 extraction units；

116 leading storage units；

300-1~300-D antennas；

301-1~301-D radio sections；

302 propagation channel characteristics determination parts；

303 storage units；

304 propagation channel characteristics notification units；

1110 base stations；

1111 terminal stations (standard criterion identical with base station 1110)；

1113 terminal stations (standard criterion before the standard criterion of base station 1110)；

1201-1~1201-A S/P transformation components；

1202-1-1~1202-B-A subcarrier-modulated portions；

1203 weight arithmetic processing sections；

1204-1~1204-C IFFT Departments；

1205-1~1205-C GI appendix；

1206-1~1206-C RF processing units；

1207-1~1207-C antennas；

1208 wireless LAN signals demodulation sections；

1209 propagation channel acquisition units；

1210 weight calculation units；

1211 Power Interpolation portions；

1212 known signal generating units；

1213 common signal generating units；

1214 known signal generating units；

1301-1~1301-D antennas；

1302-1~1302-D wireless LAN signals demodulation sections；

1303 propagation channel characteristics determination parts；

1304 storage units；

1305 propagation channel characteristics notification units；

The previous wireless LAN signals demodulation section of 1306-1~1306-D.

Claims

1. the wireless signal for having carried out directive property control is sent terminal by a kind of wireless signal sending method, at least 1 stylobate station It stands, the wireless signal sending method includes:

Known signal generation step generates and is additional to the known signal of the wireless signal, the known signal be with L-LTF with Input signal afterwards accordingly in specific sub-carrier configuration pilot subcarrier signals and includes the known signal of targeting signal；

Weight operation processing step, after the L-LTF other than the pilot subcarrier signals in the known signal Full-scale input carry out weight operation；And

Wireless processing step sends the known signal for having carried out the weight operation.

2. wireless signal sending method according to claim 1, wherein

At least 1 stylobate station is the multiple base stations for respectively constituting different communication cells,

The wireless signal sending method also includes:

Extraction step, in the subcarrier pair for being extracted from the propagation channel that the terminal station obtains with sending fixed targeting signal The propagation channel answered；And

Targeting signal weight operation processing step calculates weight based on the propagation channel extracted, to the fixation Targeting signal carries out weight operation.

3. wireless signal sending method according to claim 2, wherein

In the targeting signal in weight operation processing step,

By to calculated based on the propagation channel corresponding with the subcarrier of targeting signal for sending the fixation The weight and the targeting signal of the fixation carry out multiplying, so that precalculating weight operation finishes targeting signal,

In the wireless processing step,

It the weight operation is finished into targeting signal is additional to the wireless signal and send.

4. wireless signal sending method according to claim 3, wherein

Also including: saving step, the weight operation precomputed described in preservation finishes targeting signal,

In the wireless processing step,

The weight operation saved in the preservation step is read in defined transmission timing and finishes targeting signal, will be read The weight operation finish targeting signal and be additional to the wireless signal to be sent.

5. a kind of wireless device will carry out the wireless of directive property control in the wireless system at least 1 wireless device Signal is sent to terminal station, and the wireless device has:

Known signal generating unit generates and is additional to the known signal of the wireless signal, the known signal be with after L-LTF Input signal accordingly in specific sub-carrier configuration pilot subcarrier signals and include the known signal of targeting signal；

Weight arithmetic processing section, in the known signal generated by the known signal generating unit in addition to pilot tone L-LTF other than carrier signal later full-scale input carries out weight operation；And

Wireless processing section sends the known signal that the weight operation has been carried out by the weight arithmetic processing section.

6. wireless device according to claim 5, wherein

At least 1 wireless device is the multiple wireless devices for respectively constituting different communication cells,

The wireless device is also equipped with:

Extraction unit, it is corresponding with the fixed subcarrier of targeting signal is sent being extracted from the propagation channel that the terminal station obtains Propagation channel；And

Targeting signal weight arithmetic processing section calculates weight based on the propagation channel extracted by the extraction unit, makes Weight operation is carried out with targeting signal of the weight to the fixation.

7. wireless device according to claim 6, wherein

The targeting signal is passed through with weight arithmetic processing section to based on the sub- load with the targeting signal for sending the fixation The corresponding calculated weight of propagation channel of wave and the targeting signal of the fixation carry out multiplying to count in advance It calculates weight operation and finishes targeting signal,

The weight operation is finished targeting signal and is additional to the wireless signal by the wireless processing section to be sent.

8. wireless device according to claim 7, wherein

Be also equipped with: leading storage unit saves the weight precomputed by the targeting signal with weight arithmetic processing section Operation finishes targeting signal,

The wireless processing section is complete in the weight operation that the reading of defined transmission timing saves in the leading storage unit Finish targeting signal, the weight operation of reading is finished into targeting signal is additional to the wireless signal and send.